Re: journal on an ssd

From: Andreas Dilger <adilger sun com>

To: Tobias Oetiker <tobi oetiker ch>

Cc: ext3-users redhat com

Subject: Re: journal on an ssd

Date: Thu, 11 Sep 2008 15:17:41 -0600

On Sep 11, 2008 23:10 +0200, Tobias Oetiker wrote:
> Today Andreas Dilger wrote:
> > No, because RAID6 is terribly sucky for performance. If you need this
> > kind of reliability triple-mirrored RAID 1 would be better. Much less
> > CPU overhead, and no extra IO.
>
> do you happen to know how zfs handles it when the intent log is on
> an ssd ?
My (limited) understanding is that it will also mirror the intent log.
I'm not really a ZFS guru, and Lustre's use of the DMU doesn't (yet)
include use of the intent log.
Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.